An airplane is flying horizontally with a constant momentum during a time interv

Question

An airplane is flying horizontally with a constant momentum during a time interval . (a) Is there a net impulse acting on the plane during this time? Use the impulse-momentum theorem to guide your thinking. (b) In the horizontal direction, both the thrust generated by the engines and air resistance act on the plane. Considering your answer to part a, how is the impulse of the thrust related (in magnitude and direction) to the impulse of the force due to the air resistance?

PLEASE EXPLAIN CONCEPTUALLY!

Explanation / Answer

(a)

I = change in momentum

Since the momentum is constant, the net impulse acting on the plane is zero.

(b)

Since the net impulse is zero, The impulse of the thrust is equal in magnitude but opposite in direction to the impulse of the force due to air resistance.

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